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Help! Unique ID for CMS item

Anyone that can help?
Trying to link my ‘links’ in the navbar to a certain cms item in my onepager. Now I can’t seem to find where I can create an unique ID to a specific cms item. I tried several things, like creating a unique ID number, but nothing helped so far… I just began with coding etc. so a step by step solution is much appreciated!

Here is my read only link: